Sound WavesMedium
Question
A sound absurder attenuates the sound level by 20dB. The intensity decreases by a factor of
Options
A.100
B.1000
C.10000
D.10
Solution
We have, L1 - 10 log
L2 = 10 log
∴ L1 - L2 = 10 log
- 10 log 
or, ᐃL = 10 log
or, ᐃL = 10 log
or, ᐃ 20 = 10 log
or, 2 = log
or I2 =
= 102
or, I2 =
⇒ intensity decrease by a factor 100.
L2 = 10 log
∴ L1 - L2 = 10 log
- 10 log or, ᐃL = 10 log
or, ᐃL = 10 log
or, ᐃ 20 = 10 log
or, 2 = log
or I2 =
= 102 or, I2 =
⇒ intensity decrease by a factor 100.
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